Effects of water, fertilizer and super absorbent polymer on growth and
water use efficiency of Jatropha curcas L.
1.Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; 2.Faculty of Science, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
Abstract:A series of pot grown experiments are conducted to investigate effects of water, fertilizer and super absorbent polymer(SAP) on saplings growth and water use efficiency of Jatropha curcas L.. Two watering levels, i.e. W1: 40%ET and W2: 80%ET, two fertilizer levels, N1: 0.25 g/kg and N2: 0.5 g/kg) as well as two SAP levels, S1: 0 g/kg and S2: 2 g/kg are applied in the experiments. The results show that under N2S2 condition, the total dry mass of Jatropha curcas L. in W1 treatment is significantly reduced by 7.2% and the water use efficiency is increased by 43.2% compared with W1 treatment. Under W2S2 condition, however, the total dry mass and water use efficiency of the plant are increased 14.4% and 10.5% in W2 treatment, respectively, compared with N1 treatment. Hence, S2W2N2 should be the best condition for the saplings of Jatropha curcas L. to grow. Further, SAP can significantly improve the root system, extend the canopy and add the whole plant dry mass. At N2 level, under S2W1 condition, water is saved by 35.1%, the plant height rises by 29.0% and the evapotranspiration quantity is reduced by 45.3%; fortunately, the root and canopy mass as well as the total dry mass are heaved by 14.5%, 21.8% and 20.3%, respectively, causing an as high as 98.6% total water use efficiency, compared with S1W2 condition. Therefore, applying SAP can suppress evapotranspiration quantity and reduce the loss of water in soil; additionally, it promotes the accumulation of dry mass in the plants by means of the coupling effect with fertilizer. Eventually, the water use efficiency can be improved greatly.
荣烨, 杨启良, 江玉波, 刘小刚, 刘艳伟, 王卫华. 水肥与保水剂处理对小桐子生长与水分利用的影响[J]. 排灌机械工程学报, 2014, 32(11): 1005-1012.
Rong Ye1, Yang Qiliang1, Jiang Yubo2, Liu Xiaogang1, Liu Yanwei1, Wang Weihua1. Effects of water, fertilizer and super absorbent polymer on growth and
water use efficiency of Jatropha curcas L.. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(11): 1005-1012.